initial pandora port
[fceu.git] / mappers / 6.c
1 /* FCE Ultra - NES/Famicom Emulator
2  *
3  * Copyright notice for this file:
4  *  Copyright (C) 2002 Xodnizel
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  */
20
21 #include "mapinc.h"
22
23 static uint8 FFEmode;
24
25 #define FVRAM_BANK8(A,V) {VPage[0]=VPage[1]=VPage[2]=VPage[3]=VPage[4]=VPage[5]=VPage[6]=VPage[7]=V?&MapperExRAM[(V)<<13]-(A):&CHRRAM[(V)<<13]-(A);CHRBankList[0]=((V)<<3);CHRBankList[1]=((V)<<3)+1;CHRBankList[2]=((V)<<3)+2;CHRBankList[3]=((V)<<3)+3;CHRBankList[4]=((V)<<3)+4;CHRBankList[5]=((V)<<3)+5;CHRBankList[6]=((V)<<3)+6;CHRBankList[7]=((V)<<3)+7;PPUCHRRAM=0xFF;}
26
27 static void FP_FASTAPASS(1) FFEIRQHook(int a)
28 {
29   if(IRQa)
30   {
31    IRQCount+=a;
32    if(IRQCount>=0x10000)
33    {
34     X6502_IRQBegin(FCEU_IQEXT);
35     IRQa=0;
36     IRQCount=0;
37    }
38   }
39 }
40
41 DECLFW(Mapper6_write)
42 {
43         if(A<0x8000)
44         {
45                 switch(A){
46                 case 0x42FF:MIRROR_SET((V>>4)&1);break;
47                 case 0x42FE:onemir((V>>3)&2); FFEmode=V&0x80;break;
48                 case 0x4501:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
49                 case 0x4502:IRQCount&=0xFF00;IRQCount|=V;break;
50                 case 0x4503:IRQCount&=0xFF;IRQCount|=V<<8;IRQa=1;break;
51                 }
52         } else {
53          switch (FFEmode)
54          {
55            case 0x80:  setchr8(V); break;
56            default: ROM_BANK16(0x8000,V>>2);
57                     FVRAM_BANK8(0x0000,V&3);
58          }
59         }
60 }
61 void Mapper6_StateRestore(int version)
62 {
63  int x;
64  for(x=0;x<8;x++)
65   if(PPUCHRRAM&(1<<x))
66   {
67    if(CHRBankList[x]>7)
68     VPage[x]=&MapperExRAM[(CHRBankList[x]&31)*0x400]-(x*0x400);
69    else VPage[x]=&CHRRAM[(CHRBankList[x]&7)*0x400]-(x*0x400);
70   }
71 }
72 void Mapper6_init(void)
73 {
74 MapIRQHook=FFEIRQHook;
75 ROM_BANK16(0xc000,7);
76
77 SetWriteHandler(0x4020,0x5fff,Mapper6_write);
78 SetWriteHandler(0x8000,0xffff,Mapper6_write);
79 MapStateRestore=Mapper6_StateRestore;
80 }